GXD PC 10-11
A breed of humans that has somehow evolved to carry the annoying trait. These Trinity terds that won't flush tend to dress in neon, 80s shwag and think that the library is only for socializing.
Oh god, there's a ton of GXD PC 10-11ers on the 3rd floor of the library today. I would recommend going to the 4th floor, away from the human rodents.